Income Tax Act 2025: Key Changes, Chapters, Tax Slabs & Section Mapping

The new Income Tax Act 2025 was introduced to modernise the tax laws that had become complex after decades of amendments. The new act reorganises provisions into 536 sections across 23 chapters, making it easier for taxpayers, businesses, and tax professionals to understand and comply with tax rules.

Income Tax Act 2025 - At a Glance

Particulars	Income Tax Act 1961	Income Tax Act 2025
Effective Date	1961	1st April 2026
Total Chapters	Multiple	23 Chapters
Sections	700+ (including sub-sections)	536 Sections
Tax Year Concept	Previous Year + Assessment Year	Single Tax Year
TDS Provisions	Multiple Sections	Section 393
Status	Replaced	Current Law

What is the Income Tax Act 2025?

The Income Tax Act 2025 is a comprehensive legislation governing the levy, administration, collection, and recovery of direct taxes in India. The new tax provision aims to bring an income tax reform by simplifying income tax laws.

The new act aims at simplification of tax laws, making it easier to understand, interpret and comply with. Easy, more automated and user friendly compliance is expected to reduce the instances of non-compliance and tax avoidance techniques.

Why Was the Income Tax Act 2025 Introduced?

The Income Tax Act 1961 had become extremely complex after hundreds of amendments over decades. Many provisions were outdates, repetitive, scattered, or were in language difficult for taxpayers to interpret. 

The Income Tax Act 2025 was introduced to address these issues with the following objectives:

• Simplify the tax law
• Reduce litigation
• Improve compliance
• Modernise tax administration

New Income Tax Act 2025 PDF Download

You can download the Income Tax Act pdf from the Income Tax Department website, that will be effective from 1st April 2026.

When Does the Income Tax Act 2025 Come Into Effect?

The new Income Tax Act 2025 comes into effect from 1st April 2026 completely replacing the existing Income Tax Act 1961. The provisions of the Income Tax Act, 2025 will be applicable for Tax Year 2026-27 and onwards. 

For FY 2025-26 (AY 2026-27) the provisions of the existing old Income Tax Act, 1961 will be applicable for ITR filing. 

Therefore, the income tax returns filed for FY 2026-27 and onwards will be governed by the provisions of the Income Tax Act, 2025. 

What is a Tax Year?

The Income Tax Act, 2025 replaces the concepts of Previous Year and Assessment Year with a single Tax Year. This change applies from FY 2026-27 onwards and is intended to simplify tax compliance and reduce confusion for taxpayers. Under the new system, income earned and assessed will be referred to using the same Tax Year.

Income Tax Slab Rates Under the New Act 2025

The income tax slabs under the Income Tax Act 2025 effective 1st April 2026 are as follows:

1. New Tax Regime Slab Rates (Section 202)

The new tax regime remains the default tax regime under the Income Tax Act 2025 and is covered under Section 202. 

2. Old Tax Regime Slabs Rates

The old tax regime slab rates under the Income Tax Act 2025 are as follows:

Deductions Under the Income Tax Act 2025

Many deductions continue to exist under the new law, although the section numbering and organisation may change.

Structural Changes in the Income Tax Act 2025

Although the structure of the law has changed, the tax system itself remains largely similar. The main goal of these changes is to make tax rules easier to read and navigate.

Key Changes in Income Tax Act 2025

Although the core of the direct tax laws remain the same, the Income Tax Act 2025 introduces structural and administrative changes. Some of the major changes in Income Tax Act 2025 are as follows;

1. Simplified Structure

The Act reduces the number of sections significantly and focus on reorganising provisions to make the law easier to interpret and understand. 

2. Digital Assets Covered Explicitly

The definition of Virtual Digital Assets such as cryptocurrencies and NFTs has been more clearly defined. 

3. Reorganised Deduction Provisions

All the deduction provisions that were previously scattered across the Income Tax Act 1961 have now been reorganised and regrouped into simplified sections under the Income Tax Act 2025. 

4. Consolidated TDS Provisions

All TDS provisions have been consolidated under a single section 393. 

5. Improved Compliance Procedure

The Income Tax Act 2025 provides major boost to the compliance procedures and simplification of assessmenr, appeals, and dispute resolution processes to reduce litigation. 

What Has Not Changed Under the Income Tax Act 2025?

Despite the introduction of the Income Tax Act 2025, many key aspects of taxation remain unchanged:

• Tax slabs will continue to be announced through the annual Finance Acts.
• Capital gains will continue to be taxed as per the applicable provisions.
• Popular deductions and exemptions remain available, although their section numbers may have changed.
• NPS, health insurance, and other tax saving benefits continue under the new law.
• TDS, advance tax, and return filing requirements continue to apply.
• The basic principles of taxation, including the taxation of salary, house property, business income, and other income, remain largely unchanged.

The new law primarily focuses on simplifying and reorganising the tax provisions rather than introducing a completely new tax system.

TDS Provisions Under the Income Tax Act 2025

The Income Tax Act 2025 has clubbed all the TDS provisions under a single Section 393 - Tax to be Deducted at Source. Under the old Income Tax Act, 1961, the TDS sections were scattered among various different section based on the income type.

Old and New Income Tax Act Section Mapping

The Income Tax Department has provided a utility tool to help tax payers map sections of the Income Tax Act 1961 with that of the Income Tax Act 2025. Few major sections are now as follows under Income Tax Act 2025:

Important Forms Renamed Under the Income Tax Act 2025

How Does the Income Tax Act 2025 Affect You?

1. Salaried Taxpayers

Income Tax Act 2025 replaces the existing Assessment Year and Financial Year with a single uniform concept of Tax Year. The Act also offers enhanced limits for allowance exemptions under the Income Tax Rules, 2026. The new tax regime remains the default regime, and taxpayers have the option to opt for the old tax regime as well. 

2. NRIs Taxpayers

Income Tax Act 2025 ensure stricter compliance for NRIs through tightened provisions for reporting Foreign Assets. Failure to disclose foreign bank accounts, properties, or shares can attract heavy penalties. However, interest earned from NRE account remains tax-free. 

3. Senior Citizen Taxpayers

The Income Tax Act 2025 provides significant benefits to senior citizen taxpayers. It retains the existing tax slabs under the old tax regime offering higher basic exemption limits for senior and super senior citizens. The new act also increase the TDS threshold limit on interest to Rs. 1 lakh and and has merged Form 15G and 15H into a single new Form 121.   

Income Tax Act 2025 vs Income Tax Act 1961

The Income Tax Act, 1961 governed India’s tax system for over six decades but became complex due to multiple amendments and technical language. The Income Tax Act, 2025, effective from 1 April 2026, introduces a simpler structure and replaces the previous year and assessment year system with a single “tax year”.

Major differences between the Income Tax Act 2025 vs 1961 include the new 2025 act using clearer language, and focusing on digital tax administration and easier compliance. While the core tax principles remain largely the same, the aim is to make the tax law simpler, more transparent, and easier for taxpayers to understand.

The following table demonstrates the major changes made in Income Tax Act 2025, as compared to the Income tax Act, 1961.

Also Read:
1. Income Tax Act 2025 Section Numbers: Old (1961) vs New Complete Mapping Table
2. Form 188
3. Form 121
4. Form 130